Sliding door lock



Oct. 28, 1952 c. D. LLOYD suomc DOOR LOCK 2 sm'rs-slms'r 1 Filed Jan. 6, 1947 rw lc r Claire D L10 yd.

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Attorney Oct. 28, 1952 c. 0. LLOYD SLIDING DOOR LOCK 2 SHEETSSHEET 2 Filed Jan. 6, 1947 I INVENTOR. C lairD Llqyd.

A t'targ y Patented Oct. 28, 1952 Claire D. Lloyd,jWest Palm Beach, Fla.,- assignor Harkiso Corporation, Palm Beach, Fla., a

corporation of Florida I Application January 6, 1947,:ser'ia'1 Nmvzoses This invention relates to fasteners for slidin doors, and more particularly to features of construction which lend themselves to incorporation in either a fastener for more or less temporary privacy, or a lock for more permanent security.

4 Claims. (01. 292-96) Sliding doors and swinging doors are, of course,

well known, but sliding doors are preferable to doors of the swing type where conservationof room space is of importance. Therefore, the presentinvention is primarily intended to be applied to a Sliding door for bedrooms, bathrooms, and similar enclosures where the corners or wall space of the room are left free for the placing of furniture or other equipment, and the present invention has for its primary object the provision of a key-less lock having a novel arrangement wherein the same may be locked from the inside of the room only for temporary privacy. To that end, the invention provides a combined latch and lock structure having a convenientfinger manipulated operator at one side only while the opposite side has a more or less concealed or nonobvious operator generally known only to authorized persons, for receiving an appropriate implement, such as a screw driver, to turn the latch and release the lock in the event of an emergency, when, for example, if a child should become locked in the room, or if a person therein has become incapacitated.

A distinctive object for both temporary privacy and permanent security lock structures is to provide a novel gear connected actuator and lock bolt for swinging said bolt upward into locked position and for returning the said bolt into unlocked position, including a snap action spring arrangement connected therewith.

Another object is to provide a lock for sliding doors having a combined latch and locking bolt including an upturned hooklike latch end adapted to swing upward into the keeper plate on a door jamb, so that any lifting of the door permitted by looseness is the sliding track thereof will more securely engage the bolt. I

A further object is to providea key controlled sliding rack for imparting movement to thegear connected actuator and combined latch and lock bolt whereby the distinctive features thereof may be incorporated in a permanent security lock structure controlled by a key from either side of the door. e e

With the above and-other objects in view, the invention consists in the construction, arrangement and combination of parts hereinaftermore fully described and particularly pointed out in the appended claims.

In the-drawings, like parts throughout the several views are given similar reference'characters and are thus identified in the following detailed description: I

Figure 1 is a perspective view of the outside of a slidingdoor showing the key-less form ofthe invention includin a countersunk socket opening forreleasing th privacy lock in the event of an emergency.

Figure 2 illustrates the preferred embodiment of the invention partly in elevation and partly n cross section, so as to ino're'clearly show thework ingpa'rts thereof. I

Figure 3 is a cross section View 'takenthrough the lock casing along the line 33 of Figure .2.

Figure 4 is a fragmentary perspectiveo'f themside of a door showing the locking means for the embodiment shoWninFig'.2.

Figure 5 is a vertical sectional'viewf'showih a key controlled arrangement forj'operatin'g the lock.

'In'its primary aspect the invention includes'an actuator A and a combined latch and locking. bolt B interconnected by gear teeth. These "features may be embodied in a key-less privacy lock "as shown in Figs. 1-4 and a key operated security lockas shown in Fig.5.

Referring to Figs. 1 and 2, which illustrate the privacy lock, thereis shown a sliding door l0, and a lock casing l l which may be of two or" more parts, for example, with top and bottomp'lates l3 and 14, as shown. In 'each'topand'botto'in cover ofthe casing l I is an opening in which fits the extended ends of the actuator A which includes a hub l5 formed on each sideof a gear'ifi. This hub has a four-cornered centralopening extending through it. When the top and bottom cover plates l3 and H are in place, the gear is journalled in the casing by the hub ends, so that the gear [6 may be turned in the ope'ningby a four-cornered stub shaft H which extends approximately half-way into the opening through the hub Hi from the exteriorof the interior side of the door 10, while the opposite end of the hub opening goes through to the "exteriorside of the door and is slightly countersunk thereinand covered by a pivoted coverplate 20, see Figs. 1 and 3.

The gear I6 is preferably of the segment'type having teeth 2| formedaround only apart thereof. These gear teetharepos'itioned'so as te-eonstantly mesh with cooperating teeth ZZ'carried upon a segment 23 having a pivot opening thereinfor a pivot pin-24 mounted between'the cover member 28 includes a hooked-end latch portion 29 of foot-like shape. Said portion 29, for example, comprises an upturned toe 30, a flat end surface 3| and an arcuate or arched surface 32 each of which is shaped to serve a particular purpose in either the locked or unlocked position of the bolt 28.

The segment gear l6 and the shaft I! are turned by a ring or handle 35 pivoted to the end of the shaft ll. The ring 35 is pivoted so as to be housed in a recess 36 in the wood portion of the door, as shown in Figure 3. When the ring 35 is pulled out and turned to rotate shaft ll, turning motion is imparted to gear I6. The turning of gear I6 is yieldably resisted by a fiat resilient bar spring 38, see Figure 2. The end of the bar spring 38 seats in a V-notch 39 in the gear l6 and the other end of the spring seats in'the V-notch 40 of a lug 4| secured to the cover plate I4of the casing ID.

The lug 4| is secured in said casing below V-notch 39 in the gear l6 at a distance less than the length of the bar spring 38. That is, the bar spring is longer than the distance between the bottom of each V-notch, to thereby maintain the spring 38 bowed in off center positions to one side or the other of a normal straight line position, so as to produce an off-center snap action to the left or right when said gear is turned in a clockwise or counterclockwise direction to swing the bolt 28 to either an unlocked or a locked position.

When the bolt 28 is retracted within the casing II in an unlocked position, the flat surface 3| of the hooked end 29 is flush with the door face plate 45, and the arcuate surface 32 is in frictional engagement with the circular edge of an annular base 4| of a door pull out member 42. The door pull out member 42 is pivoted on a pin 46 and includes, an elongated shank 43 having an outer flat surface edge 44, which like the surface 3| of the bolt 28 seats within the casing flush with the door face plate 45. When in retracted flush position, the door pull 42 may be pivoted outwardly from the casing by engaging the thumb under the edge 41 of the end of the shank 43, which on the opposite inner side slopes upward into the base of the hook portion of the door pull 42. To make insertion of the thumb under the edge 41 easy, it is spaced apart slightly from a beveled edge 58 on the bottom edge of the door face plate opening, out of which swing the bolt 28 and the door pullout 42.

Locking operation-Figs. 1-4

When the segment gear |6 of the actuator is turned clockwise to the dotted line position shown in Figure 2, the spring bar 38 snaps from the full line position and kicks up the bolt 28 with the toe 30 going into engagement with the locking plate, not shown, mounted on the door jamb. The upwardly extending hooked end of the bolt 28 is of particular advantage as it provides for greater locking security. For example, in the manufacture of a sliding door track there is usually allowed some looseness between it and the door. This permits a slight lifting of the door. In some sliding door locks this lifting may permit disengagement of the hook locking device, but with the present up-turned hook, which swings upward when the door is lifted,

the hook more securely engages the door jamb locking plate.

4 Unlocking operation When the segment gear I 6 of the actuator member is turned counter-clockwise, the bar spring 38 will snap back into the full line position, shown in Figure 2, and through the intermeshing gear teeth 2| and 22 snap the bolt 26 back into the casing II. In this position the face 3| of the bolt and the face 44 of the door pull 42 are flush with the door face plate 45, and when the ring 35 is pushed into the recess 36, the door may then be pushed into its recess in the wall.

With a slight modification of the embodiment shown in Figure 2, a key operated security lock may be constructed, as shown in Figure 5 of the drawings.

In this embodiment, the actuator A and combined latch and bolt element B are controlled by a key operated slide C. The lock casing ll, actuator gear l6, shaft l1, operating ring 35, bolt 28 and door pull 42 are substantially identical, except that actuator gear l6 has a few additional gear teeth, and are accordingly given the same reference numerals. The difference between the two embodiments resides in the addition of a key hole in either side of the door communicating with the interior of the casing the addition of a rack bar C including body 56 having teeth 51 in mesh with the teeth 2| on gear I6; and the elimination of the flat bar spring 38 and notched lug 4|.

The sliding rack bar C is mounted on a pin 58 and has an elongated slot 59 through which the pin projects on which pivots a tumbler plate 60. The tumbler plate 60 is shaped so as to cooperate with a lug GI and a key notch 62 carried by the rack bar 56 on each side of the opposite end of the slot 59 from the pin 58. For example, the plate 60 has a slot 64 with enlarged openings 65 and 66 at each end to receive the lug 6| on the rack bar. As shown in Figure 5, the bolt 28 is in looking position and the rack bar has been moved to the extreme left of the casing II to thereby engage the lug 6| in the opening 65. Until moved to the right from this position by a suitable key to be inserted in the key hole 55, the tumbler plate 60 is yieldably urged downwardly onto the lug 6| by a bar spring 68. The spring 68 is curled at one end and anchored around the pivoted end of the plate 60 with its other end free, but in pressing engagement adjacent its free end against a stop lug 10, so as to constantly urge said tumbler plate downwardly over the lug 6| on the rack bar, until it is raised by a suitable key engaged in the notch '62 of the rack bar.

Thus, to unlock the bolt 28, a key of a form to engage in notch 62 will raise the tumblerplate 60 on pivot pin 5|! and unseat the lug 6| on the rack plate from back of the shoulder 1| formed by opening 55 at the end of the slot 64. When this occurs the lug 6| becomes aligned with the slot 64 and thereby permits the rack bar 56 to be moved to the right over the pin 58, until the lug rides out of slot 64 into the opening 66, and the spring 68 urges and holds the tumbler plate 60 down on the lug 6|, as the key leaves the notch 62 following a complete turn of the key.

With respect to the actuator A and the bolt B of Fig. 5, it may be pointed out that these parts may be readily substituted for the corresponding parts A and B of Fig. 2. That is to say, the slot 39a of the actuator A of Fig. 5 may be used to receive the end of spring 38, in Fig. 2. Thus, the actuator or gear hub A and bolt B of the key actuated type of lock may be interchangeable with the actuator A and bolt B of the security lock shown in Fig. 2-.

In the second embodiment the door pull 42 is used in the same manner as explained in connection with the first embodiment and it is thought that the present invention can be well understood without further description.

While I have described and illustrated only two embodiments of my invention, it is to be understood that various changes and modifications, apparent to those skilled in the art, may be made without departing from the scope of the invention as defined by the appended claims.

I claim:

1. A lock for a sliding door comprising a hollow casing adapted to be disposed in a door lock recess, said casing having an opening in the front thereof, a shaft rotatably mounted in the casing, means on the exterior of the casing for rotating said shaft, .a gear secured to and rotatable with said shaft, said gear having a slot therein, a member pivoted in the casing, said member having a hook at one end and being disposed so that it is rotatable between a position at which the hook thereof protrudes through said opening and a position at which thehook is retracted Within the casing, abutments for limiting the movement of said member between said. positions, a toothed segment carried by the said member in mesh with said gear, whereby said member may be moved between its said positions of protraction and retraction by rotation of said shaft, a lug secured within the casing having a notch therein, and a resiliently bowed bar having one end disposed in the slot and the other end in the notch to bias said gear in a direction defined by the position of the bar relative to a radial reference line between said gear and notch.

2. .A'lock for a sliding door comprising a hollow casing adapted to be disposed in a door lock recess, said casing having an opening in the front thereof, a shaft rotatably mounted in the casing, means on the exterior of the casing for rotating member in mesh with said gear, whereby said; member may be moved between its said positions of protraction and retraction by rotation of said:

shaft, a lug secured within the casing having a F notch therein facing said gear on the side of the slot thereof, and a resiliently bowed bar having one end disposed in the slot and the otherend in the notch to bias said gear in a direction defined by the position of the bar relative to a radial reference line between said gear and notch.

3. A lock as defined by claim 1 in whichthe means for rotating the .shaft comprises an operator attached to the shaft and recessed on one side of the casing.

4. A lock as defined by claim 1 in which the hook inits protracted position extends upwardly and rearwardly.

CLAIRE D. LLOYD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

